The pivotal factor in the British retreat from the American colonies during the American Revolutionary War was the growing support for independence among the colonists. Increasingly, colonists organized resistance against British taxation and policies, exemplified by events like the Boston Tea Party and the formation of the Continental Congress. Additionally, the strategic mistakes made by British military leadership, along with the involvement of allies such as France, significantly weakened British efforts. The culmination of these factors, along with the determination and resilience of the colonial militia, ultimately forced Britain to concede its control.